Cover image for Vol. 18 Issue 20

Editor: Meghan Campbell; Editorial Board Chairs: Thomas Carell, Donald Hilvert, Barbara Imperiali

Online ISSN: 1439-7633

Associated Title(s): ChemCatChem, ChemMedChem, ChemPhysChem, ChemSusChem

11_05/2010Cover Picture: Biological Iron-Monosulfide Production for Efficient Electricity Harvesting from a Deep-Sea Metal-Reducing Bacterium (ChemBioChem 5/2010)

The cover picture shows the microbial ingenuity of the deep-sea Fe-reducing bacterium Shewanella loihica PV-4 for self-organizing an electrically conductive network by using biogenic iron sulfides (FeS) as extracellular electron-transfer conduits. On p. 643 ff., K. Hashimoto et al. show that Shewanella cells exploit Fe 3d electrons in the nanosized FeS colloids for a respiratory electron-transfer reaction. In situ biological production of FeS in electrochemical cells enabled the generation of a microbial current two orders of magnitude higher than in cell cultures lacking the biogenic minerals. This substantial increase in microbial current represents the first example of exploiting the electron-conducting properties of naturally abundant biogenic minerals to efficiently harvest metabolized electrons in an electrochemical cell. The present results therefore shed light on bio- and geoinspired approaches for improving the performance of bioanode materials in biological fuel cells.

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